linux-kernel - [PATCH v6 6/8] fs/proc/task_mmu: remove conversion of seq

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Message-ID: <20250704060727.724817-7-surenb@google.com>
Date: Thu,  3 Jul 2025 23:07:24 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: akpm@...ux-foundation.org
Cc: Liam.Howlett@...cle.com, lorenzo.stoakes@...cle.com, david@...hat.com, 
	vbabka@...e.cz, peterx@...hat.com, jannh@...gle.com, hannes@...xchg.org, 
	mhocko@...nel.org, paulmck@...nel.org, shuah@...nel.org, adobriyan@...il.com, 
	brauner@...nel.org, josef@...icpanda.com, yebin10@...wei.com, 
	linux@...ssschuh.net, willy@...radead.org, osalvador@...e.de, 
	andrii@...nel.org, ryan.roberts@....com, christophe.leroy@...roup.eu, 
	tjmercier@...gle.com, kaleshsingh@...gle.com, aha310510@...il.com, 
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-mm@...ck.org, linux-kselftest@...r.kernel.org, surenb@...gle.com
Subject: [PATCH v6 6/8] fs/proc/task_mmu: remove conversion of seq_file
 position to unsigned

Back in 2.6 era, last_addr used to be stored in seq_file->version
variable, which was unsigned long. As a result, sentinels to represent
gate vma and end of all vmas used unsigned values. In more recent
kernels we don't used seq_file->version anymore and therefore conversion
from loff_t into unsigned type is not needed. Similarly, sentinel values
don't need to be unsigned. Remove type conversion for set_file position
and change sentinel values to signed.

Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 fs/proc/task_mmu.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 751479eb128f..b8bc06d05a72 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -135,7 +135,7 @@ static struct vm_area_struct *proc_get_vma(struct proc_maps_private *priv,
 	if (vma) {
 		*ppos = vma->vm_start;
 	} else {
-		*ppos = -2UL;
+		*ppos = -2;
 		vma = get_gate_vma(priv->mm);
 	}
 
@@ -145,11 +145,11 @@ static struct vm_area_struct *proc_get_vma(struct proc_maps_private *priv,
 static void *m_start(struct seq_file *m, loff_t *ppos)
 {
 	struct proc_maps_private *priv = m->private;
-	unsigned long last_addr = *ppos;
+	loff_t last_addr = *ppos;
 	struct mm_struct *mm;
 
 	/* See m_next(). Zero at the start or after lseek. */
-	if (last_addr == -1UL)
+	if (last_addr == -1)
 		return NULL;
 
 	priv->task = get_proc_task(priv->inode);
@@ -170,9 +170,9 @@ static void *m_start(struct seq_file *m, loff_t *ppos)
 		return ERR_PTR(-EINTR);
 	}
 
-	vma_iter_init(&priv->iter, mm, last_addr);
+	vma_iter_init(&priv->iter, mm, (unsigned long)last_addr);
 	hold_task_mempolicy(priv);
-	if (last_addr == -2UL)
+	if (last_addr == -2)
 		return get_gate_vma(mm);
 
 	return proc_get_vma(priv, ppos);
@@ -180,8 +180,8 @@ static void *m_start(struct seq_file *m, loff_t *ppos)
 
 static void *m_next(struct seq_file *m, void *v, loff_t *ppos)
 {
-	if (*ppos == -2UL) {
-		*ppos = -1UL;
+	if (*ppos == -2) {
+		*ppos = -1;
 		return NULL;
 	}
 	return proc_get_vma(m->private, ppos);
-- 
2.50.0.727.gbf7dc18ff4-goog